Abstract
Three point bend specimen is used for ductile fracture tests with different mixed mode ratio, K_<II>/K_I, and specimen thickness. The crack growth direction in mid-plane of the specimen changes largely with the change of K_<II>/K_I value. Detailed observation of fracture surface is conducted, and it is shown that the average void diameter is affected largely by the mixed mode ratio and specimen thickness. Numerical simulation is also carried out using Gurson's yield function. By introducing stress-controlled void nucleation model, as well as plastic-strain-controlled nucleation model, it is shown that crack growth directions at mid-plane and free surface are estimated well and results agree with experimental observations qualitatively.
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